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(#) Layout Inflation without a Parent

!!! WARNING: Layout Inflation without a Parent
   This is a warning.

Id
:   `InflateParams`
Summary
:   Layout Inflation without a Parent
Severity
:   Warning
Category
:   Correctness
Platform
:   Android
Vendor
:   Android Open Source Project
Feedback
:   https://issuetracker.google.com/issues/new?component=192708
Since
:   Initial
Affects
:   Kotlin and Java files and resource files
Editing
:   This check runs on the fly in the IDE editor
See
:   https://www.bignerdranch.com/blog/understanding-androids-layoutinflater-inflate/
Implementation
:   [Source Code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-checks/src/main/java/com/android/tools/lint/checks/LayoutInflationDetector.kt)
Tests
:   [Source Code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-tests/src/test/java/com/android/tools/lint/checks/LayoutInflationDetectorTest.java)
Copyright Year
:   2014

When inflating a layout, avoid passing in null as the parent view, since
otherwise any layout parameters on the root of the inflated layout will
be ignored.

(##) Example

Here is an example of lint warnings produced by this check:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~text
src/test/pkg/LayoutInflationTest.java:13:Warning: Avoid passing null as
the view root (needed to resolve layout parameters on the inflated
layout's root element) [InflateParams]
    convertView = mInflater.inflate(R.layout.your_layout, null);
                                                          ----
src/test/pkg/LayoutInflationTest.java:14:Warning: Avoid passing null as
the view root (needed to resolve layout parameters on the inflated
layout's root element) [InflateParams]
    convertView = mInflater.inflate(R.layout.your_layout, null, true);
                                                          ----
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Here are the relevant source files:

`src/test/pkg/LayoutInflationTest.java`:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~java linenumbers
package test.pkg;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.annotation.SuppressLint;
import java.util.ArrayList;

public abstract class LayoutInflationTest extends BaseAdapter {
    public View getView(int position, View convertView, ViewGroup parent) {
        convertView = mInflater.inflate(R.layout.your_layout, null);
        convertView = mInflater.inflate(R.layout.your_layout, null, true);
        //convertView = mInflater.inflate(R.layout.your_layout);
        convertView = mInflater.inflate(R.layout.your_layout, parent);
        convertView = WeirdInflater.inflate(convertView, null);

        return convertView;
    }

    @SuppressLint("InflateParams")
    public View getView2(int position, View convertView, ViewGroup parent) {
        convertView = mInflater.inflate(R.layout.your_layout, null);
        convertView = mInflater.inflate(R.layout.your_layout, null, true);
        convertView = mInflater.inflate(R.layout.your_layout, parent);
        convertView = WeirdInflater.inflate(convertView, null);

        return convertView;
    }
    private LayoutInflater mInflater;
    private static class R {
        private static class layout {
            public static final int your_layout = 1;
        }
    }
    private static class WeirdInflater {
        public static View inflate(View view, Object params) { return null; }
    }
}
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

`res/layout/your_layout.xml`:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~xml linenumbers
&lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/LinearLayout1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" /&gt;
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

`res/layout-port/your_layout.xml`:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~xml linenumbers
&lt;TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@id/text1"
    style="?android:attr/listSeparatorTextViewStyle" /&gt;
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

You can also visit the
[source code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-tests/src/test/java/com/android/tools/lint/checks/LayoutInflationDetectorTest.java)
for the unit tests for this check to see additional scenarios.

The above example was automatically extracted from the first unit test
found for this lint check, `LayoutInflationDetector.testFull`.
To report a problem with this extracted sample, visit
https://issuetracker.google.com/issues/new?component=192708.

(##) Suppressing

You can suppress false positives using one of the following mechanisms:

* Using a suppression annotation like this on the enclosing
  element:

  ```kt
  // Kotlin
  @Suppress("InflateParams")
  fun method() {
     inflate(...)
  }
  ```

  or

  ```java
  // Java
  @SuppressWarnings("InflateParams")
  void method() {
     inflate(...);
  }
  ```

* Using a suppression comment like this on the line above:

  ```kt
  //noinspection InflateParams
  problematicStatement()
  ```

* Adding the suppression attribute `tools:ignore="InflateParams"` on
  the problematic XML element (or one of its enclosing elements). You
  may also need to add the following namespace declaration on the root
  element in the XML file if it's not already there:
  `xmlns:tools="http://schemas.android.com/tools"`.

* Using a special `lint.xml` file in the source tree which turns off
  the check in that folder and any sub folder. A simple file might look
  like this:
  ```xml
  &lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;lint&gt;
      &lt;issue id="InflateParams" severity="ignore" /&gt;
  &lt;/lint&gt;
  ```
  Instead of `ignore` you can also change the severity here, for
  example from `error` to `warning`. You can find additional
  documentation on how to filter issues by path, regular expression and
  so on
  [here](https://googlesamples.github.io/android-custom-lint-rules/usage/lintxml.md.html).

* In Gradle projects, using the DSL syntax to configure lint. For
  example, you can use something like
  ```gradle
  lintOptions {
      disable 'InflateParams'
  }
  ```
  In Android projects this should be nested inside an `android { }`
  block.

* For manual invocations of `lint`, using the `--ignore` flag:
  ```
  $ lint --ignore InflateParams ...`
  ```

* Last, but not least, using baselines, as discussed
  [here](https://googlesamples.github.io/android-custom-lint-rules/usage/baselines.md.html).

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